Unrated severityCISA KEVNVD Advisory· Published Jul 7, 2021· Updated Dec 30, 2025
Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE
CVE-2021-22555
Description
A heap out-of-bounds write affecting Linux since v2.6.19-rc1 was discovered in net/netfilter/x_tables.c. This allows an attacker to gain privileges or cause a DoS (via heap memory corruption) through user name space
Affected products
1- Linux/Linux kerneldescription
Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
9- packetstormsecurity.com/files/163528/Linux-Kernel-Netfilter-Heap-Out-Of-Bounds-Write.htmlmitrex_refsource_MISC
- packetstormsecurity.com/files/163878/Kernel-Live-Patch-Security-Notice-LSN-0080-1.htmlmitrex_refsource_MISC
- packetstormsecurity.com/files/164155/Kernel-Live-Patch-Security-Notice-LSN-0081-1.htmlmitrex_refsource_MISC
- packetstormsecurity.com/files/164437/Netfilter-x_tables-Heap-Out-Of-Bounds-Write-Privilege-Escalation.htmlmitrex_refsource_MISC
- packetstormsecurity.com/files/165477/Kernel-Live-Patch-Security-Notice-LSN-0083-1.htmlmitrex_refsource_MISC
- git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/netfilter/x_tables.cmitrex_refsource_MISC
- git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/netfilter/x_tables.cmitrex_refsource_MISC
- github.com/google/security-research/security/advisories/GHSA-xxx5-8mvq-3528mitrex_refsource_MISC
- security.netapp.com/advisory/ntap-20210805-0010/mitrex_refsource_CONFIRM
News mentions
1- Exploits and vulnerabilities in Q1 2026Securelist · May 7, 2026